cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/arp.c

Directory: net/ipv4
/* linux/net/ipv4/arp.c
 *
 * Copyright (C) 1994 by Florian  La Roche
 *
 * This module implements the Address Resolution Protocol ARP (RFC 826),
 * which is used to convert IP addresses (or in the future maybe other
 * high-level addresses) into a low-level hardware address (like an Ethernet
 * address).
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * Fixes:
 *              Alan Cox        :       Removed the Ethernet assumptions in
 *                                      Florian's code
 *              Alan Cox        :       Fixed some small errors in the ARP
 *                                      logic
 *              Alan Cox        :       Allow >4K in /proc
 *              Alan Cox        :       Make ARP add its own protocol entry
 *              Ross Martin     :       Rewrote arp_rcv() and arp_get_info()
 *              Stephen Henson  :       Add AX25 support to arp_get_info()
 *              Alan Cox        :       Drop data when a device is downed.
 *              Alan Cox        :       Use init_timer().
 *              Alan Cox        :       Double lock fixes.
 *              Martin Seine    :       Move the arphdr structure
 *                                      to if_arp.h for compatibility.
 *                                      with BSD based programs.
 *              Andrew Tridgell :       Added ARP netmask code and
 *                                      re-arranged proxy handling.
 *              Alan Cox        :       Changed to use notifiers.
 *              Niibe Yutaka    :       Reply for this device or proxies only.
 *              Alan Cox        :       Don't proxy across hardware types!
 *              Jonathan Naylor :       Added support for NET/ROM.
 *              Mike Shaver     :       RFC1122 checks.
 *              Jonathan Naylor :       Only lookup the hardware address for
 *                                      the correct hardware type.
 *              Germano Caronni :       Assorted subtle races.
 *              Craig Schlenter :       Don't modify permanent entry
 *                                      during arp_rcv.
 *              Russ Nelson     :       Tidied up a few bits.
 *              Alexey Kuznetsov:       Major changes to caching and behaviour,
 *                                      eg intelligent arp probing and
 *                                      generation
 *                                      of host down events.
 *              Alan Cox        :       Missing unlock in device events.
 *              Eckes           :       ARP ioctl control errors.
 *              Alexey Kuznetsov:       Arp free fix.
 *              Manuel Rodriguez:       Gratuitous ARP.
 *              Jonathan Layes  :       Added arpd support through kerneld
 *                                      message queue (960314)
 *              Mike Shaver     :       /proc/sys/net/ipv4/arp_* support
 *              Mike McLagan    :       Routing by source
 *              Stuart Cheshire :       Metricom and grat arp fixes
 *                                      *** FOR 2.1 clean this up ***
 *              Lawrence V. Stefani: (08/12/96) Added FDDI support.
 *              Alan Cox        :       Took the AP1000 nasty FDDI hack and
 *                                      folded into the mainstream FDDI code.
 *                                      Ack spit, Linus how did you allow that
 *                                      one in...
 *              Jes Sorensen    :       Make FDDI work again in 2.1.x and
 *                                      clean up the APFDDI & gen. FDDI bits.
 *              Alexey Kuznetsov:       new arp state machine;
 *                                      now it is in net/core/neighbour.c.
 *              Krzysztof Halasa:       Added Frame Relay ARP support.
 *              Arnaldo C. Melo :       convert /proc/net/arp to seq_file
 *              Shmulik Hen:            Split arp_send to arp_create and
 *                                      arp_xmit so intermediate drivers like
 *                                      bonding can change the skb before
 *                                      sending (e.g. insert 8021q tag).
 *              Harald Welte    :       convert to make use of jenkins hash
 *              Jesper D. Brouer:       Proxy ARP PVLAN RFC 3069 support.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/capability.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/mm.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/fddidevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif

#include <net/net_namespace.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <net/sock.h>
#include <net/arp.h>
#include <net/ax25.h>
#include <net/netrom.h>
#include <net/dst_metadata.h>
#include <net/ip_tunnels.h>

#include <linux/uaccess.h>

#include <linux/netfilter_arp.h>

/*
 *      Interface to generic neighbour cache.
 */
static u32 arp_hash(const void *pkey, const struct net_device *dev, __u32 *hash_rnd);
static bool arp_key_eq(const struct neighbour *n, const void *pkey);
static int arp_constructor(struct neighbour *neigh);
static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb);
static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb);
static void parp_redo(struct sk_buff *skb);


static const struct neigh_ops arp_generic_ops = {
	.family =		AF_INET,
	.solicit =		arp_solicit,
	.error_report =		arp_error_report,
	.output =		neigh_resolve_output,
	.connected_output =	neigh_connected_output,
};


static const struct neigh_ops arp_hh_ops = {
	.family =		AF_INET,
	.solicit =		arp_solicit,
	.error_report =		arp_error_report,
	.output =		neigh_resolve_output,
	.connected_output =	neigh_resolve_output,
};


static const struct neigh_ops arp_direct_ops = {
	.family =		AF_INET,
	.output =		neigh_direct_output,
	.connected_output =	neigh_direct_output,
};


struct neigh_table arp_tbl = {
	.family		= AF_INET,
	.key_len	= 4,
	.protocol	= cpu_to_be16(ETH_P_IP),
	.hash		= arp_hash,
	.key_eq		= arp_key_eq,
	.constructor	= arp_constructor,
	.proxy_redo	= parp_redo,
	.id		= "arp_cache",
	.parms		= {
		.tbl			= &arp_tbl,
		.reachable_time		= 30 * HZ,
		.data	= {
			[NEIGH_VAR_MCAST_PROBES] = 3,
			[NEIGH_VAR_UCAST_PROBES] = 3,
			[NEIGH_VAR_RETRANS_TIME] = 1 * HZ,
			[NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ,
			[NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
			[NEIGH_VAR_GC_STALETIME] = 60 * HZ,
			[NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024,
			[NEIGH_VAR_PROXY_QLEN] = 64,
			[NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
			[NEIGH_VAR_PROXY_DELAY]	= (8 * HZ) / 10,
			[NEIGH_VAR_LOCKTIME] = 1 * HZ,
                },
        },
	.gc_interval	= 30 * HZ,
	.gc_thresh1	= 128,
	.gc_thresh2	= 512,
	.gc_thresh3	= 1024,
};

EXPORT_SYMBOL(arp_tbl);


int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir) { switch (dev->type) { case ARPHRD_ETHER: case ARPHRD_FDDI: case ARPHRD_IEEE802: ip_eth_mc_map(addr, haddr); return 0; case ARPHRD_INFINIBAND: ip_ib_mc_map(addr, dev->broadcast, haddr); return 0; case ARPHRD_IPGRE: ip_ipgre_mc_map(addr, dev->broadcast, haddr); return 0; default: if (dir) { memcpy(haddr, dev->broadcast, dev->addr_len); return 0; } } return -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7468.52%660.00%
Timo Teräs1715.74%110.00%
Roland Dreier1211.11%110.00%
Rolf Manderscheid43.70%110.00%
Al Viro10.93%110.00%
Total108100.00%10100.00%


static u32 arp_hash(const void *pkey, const struct net_device *dev, __u32 *hash_rnd) { return arp_hashfn(pkey, dev, hash_rnd); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2064.52%120.00%
David S. Miller825.81%360.00%
Eric Dumazet39.68%120.00%
Total31100.00%5100.00%


static bool arp_key_eq(const struct neighbour *neigh, const void *pkey) { return neigh_key_eq32(neigh, pkey); }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann25100.00%1100.00%
Total25100.00%1100.00%


static int arp_constructor(struct neighbour *neigh) { __be32 addr = *(__be32 *)neigh->primary_key; struct net_device *dev = neigh->dev; struct in_device *in_dev; struct neigh_parms *parms; rcu_read_lock(); in_dev = __in_dev_get_rcu(dev); if (!in_dev) { rcu_read_unlock(); return -EINVAL; } neigh->type = inet_addr_type_dev_table(dev_net(dev), dev, addr); parms = in_dev->arp_parms; __neigh_parms_put(neigh->parms); neigh->parms = neigh_parms_clone(parms); rcu_read_unlock(); if (!dev->header_ops) { neigh->nud_state = NUD_NOARP; neigh->ops = &arp_direct_ops; neigh->output = neigh_direct_output; } else { /* Good devices (checked by reading texts, but only Ethernet is tested) ARPHRD_ETHER: (ethernet, apfddi) ARPHRD_FDDI: (fddi) ARPHRD_IEEE802: (tr) ARPHRD_METRICOM: (strip) ARPHRD_ARCNET: etc. etc. etc. ARPHRD_IPDDP will also work, if author repairs it. I did not it, because this driver does not work even in old paradigm. */ if (neigh->type == RTN_MULTICAST) { neigh->nud_state = NUD_NOARP; arp_mc_map(addr, neigh->ha, dev, 1); } else if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) { neigh->nud_state = NUD_NOARP; memcpy(neigh->ha, dev->dev_addr, dev->addr_len); } else if (neigh->type == RTN_BROADCAST || (dev->flags & IFF_POINTOPOINT)) { neigh->nud_state = NUD_NOARP; memcpy(neigh->ha, dev->broadcast, dev->addr_len); } if (dev->header_ops->cache) neigh->ops = &arp_hh_ops; else neigh->ops = &arp_generic_ops; if (neigh->nud_state & NUD_VALID) neigh->output = neigh->ops->connected_output; else neigh->output = neigh->ops->output; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)24080.27%1150.00%
Herbert Xu3210.70%29.09%
Denis V. Lunev103.34%29.09%
Stephen Hemminger51.67%14.55%
David Ahern31.00%14.55%
Hideaki Yoshifuji / 吉藤英明31.00%14.55%
Al Viro20.67%14.55%
Changli Gao20.67%14.55%
David S. Miller10.33%14.55%
Ian Morris10.33%14.55%
Total299100.00%22100.00%


static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb) { dst_link_failure(skb); kfree_skb(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)26100.00%4100.00%
Total26100.00%4100.00%

/* Create and send an arp packet. */
static void arp_send_dst(int type, int ptype, __be32 dest_ip, struct net_device *dev, __be32 src_ip, const unsigned char *dest_hw, const unsigned char *src_hw, const unsigned char *target_hw, struct dst_entry *dst) { struct sk_buff *skb; /* arp on this interface. */ if (dev->flags & IFF_NOARP) return; skb = arp_create(type, ptype, dest_ip, dev, src_ip, dest_hw, src_hw, target_hw); if (!skb) return; skb_dst_set(skb, dst_clone(dst)); arp_xmit(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf9693.20%133.33%
Jiri Benc76.80%266.67%
Total103100.00%3100.00%


void arp_send(int type, int ptype, __be32 dest_ip, struct net_device *dev, __be32 src_ip, const unsigned char *dest_hw, const unsigned char *src_hw, const unsigned char *target_hw) { arp_send_dst(type, ptype, dest_ip, dev, src_ip, dest_hw, src_hw, target_hw, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Graf61100.00%1100.00%
Total61100.00%1100.00%

EXPORT_SYMBOL(arp_send);
static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) { __be32 saddr = 0; u8 dst_ha[MAX_ADDR_LEN], *dst_hw = NULL; struct net_device *dev = neigh->dev; __be32 target = *(__be32 *)neigh->primary_key; int probes = atomic_read(&neigh->probes); struct in_device *in_dev; struct dst_entry *dst = NULL; rcu_read_lock(); in_dev = __in_dev_get_rcu(dev); if (!in_dev) { rcu_read_unlock(); return; } switch (IN_DEV_ARP_ANNOUNCE(in_dev)) { default: case 0: /* By default announce any local IP */ if (skb && inet_addr_type_dev_table(dev_net(dev), dev, ip_hdr(skb)->saddr) == RTN_LOCAL) saddr = ip_hdr(skb)->saddr; break; case 1: /* Restrict announcements of saddr in same subnet */ if (!skb) break; saddr = ip_hdr(skb)->saddr; if (inet_addr_type_dev_table(dev_net(dev), dev, saddr) == RTN_LOCAL) { /* saddr should be known to target */ if (inet_addr_onlink(in_dev, target, saddr)) break; } saddr = 0; break; case 2: /* Avoid secondary IPs, get a primary/preferred one */ break; } rcu_read_unlock(); if (!saddr) saddr = inet_select_addr(dev, target, RT_SCOPE_LINK); probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); if (probes < 0) { if (!(neigh->nud_state & NUD_VALID)) pr_debug("trying to ucast probe in NUD_INVALID\n"); neigh_ha_snapshot(dst_ha, neigh, dev); dst_hw = dst_ha; } else { probes -= NEIGH_VAR(neigh->parms, APP_PROBES); if (probes < 0) { neigh_app_ns(neigh); return; } } if (skb && !(dev->priv_flags & IFF_XMIT_DST_RELEASE)) dst = skb_dst(skb); arp_send_dst(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr, dst_hw, dev->dev_addr, NULL, dst); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)14040.94%833.33%
Julian Anastasov8524.85%14.17%
Jiri Benc288.19%14.17%
Eric Dumazet236.73%28.33%
Changli Gao113.22%14.17%
Américo Wang102.92%14.17%
Jiri Pirko102.92%14.17%
Arnaldo Carvalho de Melo92.63%14.17%
David Ahern61.75%14.17%
Hideaki Yoshifuji / 吉藤英明61.75%14.17%
David S. Miller41.17%14.17%
Al Viro30.88%14.17%
Thomas Graf20.58%14.17%
Eric W. Biedermann20.58%14.17%
Denis V. Lunev20.58%14.17%
Joe Perches10.29%14.17%
Total342100.00%24100.00%


static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip) { struct net *net = dev_net(in_dev->dev); int scope; switch (IN_DEV_ARP_IGNORE(in_dev)) { case 0: /* Reply, the tip is already validated */ return 0; case 1: /* Reply only if tip is configured on the incoming interface */ sip = 0; scope = RT_SCOPE_HOST; break; case 2: /* * Reply only if tip is configured on the incoming interface * and is in same subnet as sip */ scope = RT_SCOPE_HOST; break; case 3: /* Do not reply for scope host addresses */ sip = 0; scope = RT_SCOPE_LINK; in_dev = NULL; break; case 4: /* Reserved */ case 5: case 6: case 7: return 0; case 8: /* Do not reply */ return 1; default: return 0; } return !inet_confirm_addr(net, in_dev, sip, tip, scope); }

Contributors

PersonTokensPropCommitsCommitProp
Julian Anastasov10883.72%125.00%
Nicolas Dichtel1813.95%125.00%
Al Viro21.55%125.00%
Denis V. Lunev10.78%125.00%
Total129100.00%4100.00%


static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev) { struct rtable *rt; int flag = 0; /*unsigned long now; */ struct net *net = dev_net(dev); rt = ip_route_output(net, sip, tip, 0, 0); if (IS_ERR(rt)) return 1; if (rt->dst.dev != dev) { __NET_INC_STATS(net, LINUX_MIB_ARPFILTER); flag = 1; } ip_rt_put(rt); return flag; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds5861.70%19.09%
David S. Miller1718.09%218.18%
Pavel Emelyanov1010.64%218.18%
Hideaki Yoshifuji / 吉藤英明44.26%218.18%
Al Viro22.13%19.09%
Denis V. Lunev22.13%218.18%
Eric Dumazet11.06%19.09%
Total94100.00%11100.00%

/* * Check if we can use proxy ARP for this path */
static inline int arp_fwd_proxy(struct in_device *in_dev, struct net_device *dev, struct rtable *rt) { struct in_device *out_dev; int imi, omi = -1; if (rt->dst.dev == dev) return 0; if (!IN_DEV_PROXY_ARP(in_dev)) return 0; imi = IN_DEV_MEDIUM_ID(in_dev); if (imi == 0) return 1; if (imi == -1) return 0; /* place to check for proxy_arp for routes */ out_dev = __in_dev_get_rcu(rt->dst.dev); if (out_dev) omi = IN_DEV_MEDIUM_ID(out_dev); return omi != imi && omi != -1; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Kuznetsov9177.12%125.00%
Jesper Dangaard Brouer1815.25%125.00%
Eric Dumazet54.24%125.00%
Changli Gao43.39%125.00%
Total118100.00%4100.00%

/* * Check for RFC3069 proxy arp private VLAN (allow to send back to same dev) * * RFC3069 supports proxy arp replies back to the same interface. This * is done to support (ethernet) switch features, like RFC 3069, where * the individual ports are not allowed to communicate with each * other, BUT they are allowed to talk to the upstream router. As * described in RFC 3069, it is possible to allow these hosts to * communicate through the upstream router, by proxy_arp'ing. * * RFC 3069: "VLAN Aggregation for Efficient IP Address Allocation" * * This technology is known by different names: * In RFC 3069 it is called VLAN Aggregation. * Cisco and Allied Telesyn call it Private VLAN. * Hewlett-Packard call it Source-Port filtering or port-isolation. * Ericsson call it MAC-Forced Forwarding (RFC Draft). * */
static inline int arp_fwd_pvlan(struct in_device *in_dev, struct net_device *dev, struct rtable *rt, __be32 sip, __be32 tip) { /* Private VLAN is only concerned about the same ethernet segment */ if (rt->dst.dev != dev) return 0; /* Don't reply on self probes (often done by windowz boxes)*/ if (sip == tip) return 0; if (IN_DEV_PROXY_ARP_PVLAN(in_dev)) return 1; else return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jesper Dangaard Brouer66100.00%1100.00%
Total66100.00%1100.00%

/* * Interface to link layer: send routine and receive handler. */ /* * Create an arp packet. If dest_hw is not set, we create a broadcast * message. */
struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, struct net_device *dev, __be32 src_ip, const unsigned char *dest_hw, const unsigned char *src_hw, const unsigned char *target_hw) { struct sk_buff *skb; struct arphdr *arp; unsigned char *arp_ptr; int hlen = LL_RESERVED_SPACE(dev); int tlen = dev->needed_tailroom; /* * Allocate a buffer */ skb = alloc_skb(arp_hdr_len(dev) + hlen + tlen, GFP_ATOMIC); if (!skb) return NULL; skb_reserve(skb, hlen); skb_reset_network_header(skb); arp = (struct arphdr *) skb_put(skb, arp_hdr_len(dev)); skb->dev = dev; skb->protocol = htons(ETH_P_ARP); if (!src_hw) src_hw = dev->dev_addr; if (!dest_hw) dest_hw = dev->broadcast; /* * Fill the device header for the ARP frame */ if (dev_hard_header(skb, dev, ptype, dest_hw, src_hw, skb->len) < 0) goto out; /* * Fill out the arp protocol part. * * The arp hardware type should match the device type, except for FDDI, * which (according to RFC 1390) should always equal 1 (Ethernet). */ /* * Exceptions everywhere. AX.25 uses the AX.25 PID value not the * DIX code for the protocol. Make these device structure fields. */ switch (dev->type) { default: arp->ar_hrd = htons(dev->type); arp->ar_pro = htons(ETH_P_IP); break; #if IS_ENABLED(CONFIG_AX25) case ARPHRD_AX25: arp->ar_hrd = htons(ARPHRD_AX25); arp->ar_pro = htons(AX25_P_IP); break; #if IS_ENABLED(CONFIG_NETROM) case ARPHRD_NETROM: arp->ar_hrd = htons(ARPHRD_NETROM); arp->ar_pro = htons(AX25_P_IP); break; #endif #endif #if IS_ENABLED(CONFIG_FDDI) case ARPHRD_FDDI: arp->ar_hrd = htons(ARPHRD_ETHER); arp->ar_pro = htons(ETH_P_IP); break; #endif } arp->ar_hln = dev->addr_len; arp->ar_pln = 4; arp->ar_op = htons(type); arp_ptr = (unsigned char *)(arp + 1); memcpy(arp_ptr, src_hw, dev->addr_len); arp_ptr += dev->addr_len; memcpy(arp_ptr, &src_ip, 4); arp_ptr += 4; switch (dev->type) { #if IS_ENABLED(CONFIG_FIREWIRE_NET) case ARPHRD_IEEE1394: break; #endif default: if (target_hw) memcpy(arp_ptr, target_hw, dev->addr_len); else memset(arp_ptr, 0, dev->addr_len); arp_ptr += dev->addr_len; } memcpy(arp_ptr, &dest_ip, 4); return skb; out: kfree_skb(skb); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)36279.74%1961.29%
Hideaki Yoshifuji / 吉藤英明214.63%13.23%
Shmulik Hen214.63%13.23%
Herbert Xu194.19%13.23%
Arnaldo Carvalho de Melo112.42%26.45%
David S. Miller40.88%13.23%
Pavel Emelyanov40.88%13.23%
Ian Morris30.66%13.23%
Jan Engelhardt30.66%13.23%
Igor Maravić30.66%13.23%
Al Viro20.44%13.23%
Stephen Hemminger10.22%13.23%
Total454100.00%31100.00%

EXPORT_SYMBOL(arp_create);
static int arp_xmit_finish(struct net *net, struct sock *sk, struct sk_buff *skb) { return dev_queue_xmit(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann27100.00%2100.00%
Total27100.00%2100.00%

/* * Send an arp packet. */
void arp_xmit(struct sk_buff *skb) { /* Send it off, maybe filter it using firewalling first. */ NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, dev_net(skb->dev), NULL, skb, NULL, skb->dev, arp_xmit_finish); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1232.43%225.00%
Shmulik Hen1232.43%112.50%
Eric W. Biedermann821.62%225.00%
Linus Torvalds (pre-git)410.81%225.00%
Jan Engelhardt12.70%112.50%
Total37100.00%8100.00%

EXPORT_SYMBOL(arp_xmit); /* * Process an arp request. */
static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb) { struct net_device *dev = skb->dev; struct in_device *in_dev = __in_dev_get_rcu(dev); struct arphdr *arp; unsigned char *arp_ptr; struct rtable *rt; unsigned char *sha; __be32 sip, tip; u16 dev_type = dev->type; int addr_type; struct neighbour *n; struct dst_entry *reply_dst = NULL; bool is_garp = false; /* arp_rcv below verifies the ARP header and verifies the device * is ARP'able. */ if (!in_dev) goto out_free_skb; arp = arp_hdr(skb); switch (dev_type) { default: if (arp->ar_pro != htons(ETH_P_IP) || htons(dev_type) != arp->ar_hrd) goto out_free_skb; break; case ARPHRD_ETHER: case ARPHRD_FDDI: case ARPHRD_IEEE802: /* * ETHERNET, and Fibre Channel (which are IEEE 802 * devices, according to RFC 2625) devices will accept ARP * hardware types of either 1 (Ethernet) or 6 (IEEE 802.2). * This is the case also of FDDI, where the RFC 1390 says that * FDDI devices should accept ARP hardware of (1) Ethernet, * however, to be more robust, we'll accept both 1 (Ethernet) * or 6 (IEEE 802.2) */ if ((arp->ar_hrd != htons(ARPHRD_ETHER) && arp->ar_hrd != htons(ARPHRD_IEEE802)) || arp->ar_pro != htons(ETH_P_IP)) goto out_free_skb; break; case ARPHRD_AX25: if (arp->ar_pro != htons(AX25_P_IP) || arp->ar_hrd != htons(ARPHRD_AX25)) goto out_free_skb; break; case ARPHRD_NETROM: if (arp->ar_pro != htons(AX25_P_IP) || arp->ar_hrd != htons(ARPHRD_NETROM)) goto out_free_skb; break; } /* Understand only these message types */ if (arp->ar_op != htons(ARPOP_REPLY) && arp->ar_op != htons(ARPOP_REQUEST)) goto out_free_skb; /* * Extract fields */ arp_ptr = (unsigned char *)(arp + 1); sha = arp_ptr; arp_ptr += dev->addr_len; memcpy(&sip, arp_ptr, 4); arp_ptr += 4; switch (dev_type) { #if IS_ENABLED(CONFIG_FIREWIRE_NET) case ARPHRD_IEEE1394: break; #endif default: arp_ptr += dev->addr_len; } memcpy(&tip, arp_ptr, 4); /* * Check for bad requests for 127.x.x.x and requests for multicast * addresses. If this is one such, delete it. */ if (ipv4_is_multicast(tip) || (!IN_DEV_ROUTE_LOCALNET(in_dev) && ipv4_is_loopback(tip))) goto out_free_skb; /* * For some 802.11 wireless deployments (and possibly other networks), * there will be an ARP proxy and gratuitous ARP frames are attacks * and thus should not be accepted. */ if (sip == tip && IN_DEV_ORCONF(in_dev, DROP_GRATUITOUS_ARP)) goto out_free_skb; /* * Special case: We must set Frame Relay source Q.922 address */ if (dev_type == ARPHRD_DLCI) sha = dev->broadcast; /* * Process entry. The idea here is we want to send a reply if it is a * request for us or if it is a request for someone else that we hold * a proxy for. We want to add an entry to our cache if it is a reply * to us or if it is a request for our address. * (The assumption for this last is that if someone is requesting our * address, they are probably intending to talk to us, so it saves time * if we cache their address. Their address is also probably not in * our cache, since ours is not in their cache.) * * Putting this another way, we only care about replies if they are to * us, in which case we add them to the cache. For requests, we care * about those for us and those for our proxies. We reply to both, * and in the case of requests for us we add the requester to the arp * cache. */ if (arp->ar_op == htons(ARPOP_REQUEST) && skb_metadata_dst(skb)) reply_dst = (struct dst_entry *) iptunnel_metadata_reply(skb_metadata_dst(skb), GFP_ATOMIC); /* Special case: IPv4 duplicate address detection packet (RFC2131) */ if (sip == 0) { if (arp->ar_op == htons(ARPOP_REQUEST) && inet_addr_type_dev_table(net, dev, tip) == RTN_LOCAL && !arp_ignore(in_dev, sip, tip)) arp_send_dst(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, dev->dev_addr, sha, reply_dst); goto out_consume_skb; } if (arp->ar_op == htons(ARPOP_REQUEST) && ip_route_input_noref(skb, tip, sip, 0, dev) == 0) { rt = skb_rtable(skb); addr_type = rt->rt_type; if (addr_type == RTN_LOCAL) { int dont_send; dont_send = arp_ignore(in_dev, sip, tip); if (!dont_send && IN_DEV_ARPFILTER(in_dev)) dont_send = arp_filter(sip, tip, dev); if (!dont_send) { n = neigh_event_ns(&arp_tbl, sha, &sip, dev); if (n) { arp_send_dst(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, dev->dev_addr, sha, reply_dst); neigh_release(n); } } goto out_consume_skb; } else if (IN_DEV_FORWARD(in_dev)) { if (addr_type == RTN_UNICAST && (arp_fwd_proxy(in_dev, dev, rt) || arp_fwd_pvlan(in_dev, dev, rt, sip, tip) || (rt->dst.dev != dev && pneigh_lookup(&arp_tbl, net, &tip, dev, 0)))) { n = neigh_event_ns(&arp_tbl, sha, &sip, dev); if (n) neigh_release(n); if (NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED || skb->pkt_type == PACKET_HOST || NEIGH_VAR(in_dev->arp_parms, PROXY_DELAY) == 0) { arp_send_dst(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, dev->dev_addr, sha, reply_dst); } else { pneigh_enqueue(&arp_tbl, in_dev->arp_parms, skb); goto out_free_dst; } goto out_consume_skb; } } } /* Update our ARP tables */ n = __neigh_lookup(&arp_tbl, &sip, dev, 0); if (IN_DEV_ARP_ACCEPT(in_dev)) { unsigned int addr_type = inet_addr_type_dev_table(net, dev, sip); /* Unsolicited ARP is not accepted by default. It is possible, that this option should be enabled for some devices (strip is candidate) */ is_garp = arp->ar_op == htons(ARPOP_REQUEST) && tip == sip && addr_type == RTN_UNICAST; if (!n && ((arp->ar_op == htons(ARPOP_REPLY) && addr_type == RTN_UNICAST) || is_garp)) n = __neigh_lookup(&arp_tbl, &sip, dev, 1); } if (n) { int state = NUD_REACHABLE; int override; /* If several different ARP replies follows back-to-back, use the FIRST one. It is possible, if several proxy agents are active. Taking the first reply prevents arp trashing and chooses the fastest router. */ override = time_after(jiffies, n->updated + NEIGH_VAR(n->parms, LOCKTIME)) || is_garp; /* Broadcast replies and request packets do not assert neighbour reachability. */ if (arp->ar_op != htons(ARPOP_REPLY) || skb->pkt_type != PACKET_HOST) state = NUD_STALE; neigh_update(n, sha, state, override ? NEIGH_UPDATE_F_OVERRIDE : 0); neigh_release(n); } out_consume_skb: consume_skb(skb); out_free_dst: dst_release(reply_dst); return NET_RX_SUCCESS; out_free_skb: kfree_skb(skb); return NET_RX_DROP; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)54454.35%2231.88%
Linus Torvalds717.09%34.35%
Jiri Benc585.79%22.90%
David S. Miller424.20%45.80%
Salam Noureddine282.80%11.45%
Hideaki Yoshifuji / 吉藤英明252.50%34.35%
Julian Anastasov252.50%11.45%
Arnaldo Carvalho de Melo232.30%22.90%
Zhang Shengju232.30%11.45%
Ben Greear222.20%11.45%
Thomas Graf202.00%22.90%
David Ahern181.80%11.45%
Johannes Berg161.60%11.45%
Jesper Dangaard Brouer151.50%11.45%
Jiri Pirko101.00%11.45%
Neil Horman90.90%34.35%
Eric W. Biedermann90.90%45.80%
Octavian Purdila90.90%11.45%
David L Stevens70.70%11.45%
Patrick McHardy50.50%11.45%
Eric Dumazet40.40%22.90%
Alexey Kuznetsov30.30%11.45%
Denis V. Lunev30.30%11.45%
Ian Morris20.20%11.45%
Changli Gao20.20%22.90%
Jonas Danielsson20.20%11.45%
Herbert Xu20.20%11.45%
Paul Gortmaker10.10%11.45%
Andi Kleen10.10%11.45%
Adrian Bunk10.10%11.45%
Al Viro10.10%11.45%
Total1001100.00%69100.00%


static void parp_redo(struct sk_buff *skb) { arp_process(dev_net(skb->dev), NULL, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu1664.00%133.33%
Eric W. Biedermann728.00%133.33%
David S. Miller28.00%133.33%
Total25100.00%3100.00%

/* * Receive an arp request from the device layer. */
static int arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) { const struct arphdr *arp; /* do not tweak dropwatch on an ARP we will ignore */ if (dev->flags & IFF_NOARP || skb->pkt_type == PACKET_OTHERHOST || skb->pkt_type == PACKET_LOOPBACK) goto consumeskb; skb = skb_share_check(skb, GFP_ATOMIC); if (!skb) goto out_of_mem; /* ARP header, plus 2 device addresses, plus 2 IP addresses. */ if (!pskb_may_pull(skb, arp_hdr_len(dev))) goto freeskb; arp = arp_hdr(skb); if (arp->ar_hln != dev->addr_len || arp->ar_pln != 4) goto freeskb; memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, dev_net(dev), NULL, skb, dev, NULL, arp_process); consumeskb: consume_skb(skb); return NET_RX_SUCCESS; freeskb: kfree_skb(skb); out_of_mem: return NET_RX_DROP; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller8548.02%529.41%
Eric Dumazet4022.60%15.88%
Patrick McHardy169.04%15.88%
Rick Jones116.21%15.88%
Linus Torvalds73.95%15.88%
Eric W. Biedermann52.82%15.88%
Linus Torvalds (pre-git)52.82%211.76%
Arnaldo Carvalho de Melo31.69%15.88%
Zhang Shengju21.13%15.88%
Jan Engelhardt10.56%15.88%
Pavel Emelyanov10.56%15.88%
Adrian Bunk10.56%15.88%
Total177100.00%17100.00%

/* * User level interface (ioctl) */ /* * Set (create) an ARP cache entry. */
static int arp_req_set_proxy(struct net *net, struct net_device *dev, int on) { if (!dev) { IPV4_DEVCONF_ALL(net, PROXY_ARP) = on; return 0; } if (__in_dev_get_rtnl(dev)) { IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, on); return 0; } return -ENXIO; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov6395.45%360.00%
Eric Dumazet23.03%120.00%
Ian Morris11.52%120.00%
Total66100.00%5100.00%


static int arp_req_set_public(struct net *net, struct arpreq *r, struct net_device *dev) { __be32 ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr; if (mask && mask != htonl(0xFFFFFFFF)) return -EINVAL; if (!dev && (r->arp_flags & ATF_COM)) { dev = dev_getbyhwaddr_rcu(net, r->arp_ha.sa_family, r->arp_ha.sa_data); if (!dev) return -ENODEV; } if (mask) { if (!pneigh_lookup(&arp_tbl, net, &ip, dev, 1)) return -ENOBUFS; return 0; } return arp_req_set_proxy(net, dev, 1); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)13484.81%738.89%
Pavel Emelyanov95.70%316.67%
Al Viro53.16%15.56%
Eric W. Biedermann31.90%211.11%
Denis V. Lunev21.27%15.56%
Herbert Xu21.27%15.56%
Eric Dumazet10.63%15.56%
Adrian Bunk10.63%15.56%
Ian Morris10.63%15.56%
Total158100.00%18100.00%


static int arp_req_set(struct net *net, struct arpreq *r, struct net_device *dev) { __be32 ip; struct neighbour *neigh; int err; if (r->arp_flags & ATF_PUBL) return arp_req_set_public(net, r, dev); ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; if (r->arp_flags & ATF_PERM) r->arp_flags |= ATF_COM; if (!dev) { struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0); if (IS_ERR(rt)) return PTR_ERR(rt); dev = rt->dst.dev; ip_rt_put(rt); if (!dev) return -EINVAL; } switch (dev->type) { #if IS_ENABLED(CONFIG_FDDI) case ARPHRD_FDDI: /* * According to RFC 1390, FDDI devices should accept ARP * hardware types of 1 (Ethernet). However, to be more * robust, we'll accept hardware types of either 1 (Ethernet) * or 6 (IEEE 802.2). */ if (r->arp_ha.sa_family != ARPHRD_FDDI && r->arp_ha.sa_family != ARPHRD_ETHER && r->arp_ha.sa_family != ARPHRD_IEEE802) return -EINVAL; break; #endif default: if (r->arp_ha.sa_family != dev->type) return -EINVAL; break; } neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev); err = PTR_ERR(neigh); if (!IS_ERR(neigh)) { unsigned int state = NUD_STALE; if (r->arp_flags & ATF_PERM) state = NUD_PERMANENT; err = neigh_update(neigh, (r->arp_flags & ATF_COM) ? r->arp_ha.sa_data : NULL, state, NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); neigh_release(neigh); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)14950.34%840.00%
Pavel Emelyanov6722.64%210.00%
Maciej W. Rozycki4816.22%15.00%
David S. Miller227.43%315.00%
Hideaki Yoshifuji / 吉藤英明31.01%15.00%
Denis V. Lunev20.68%15.00%
Changli Gao20.68%15.00%
Igor Maravić10.34%15.00%
Eric Dumazet10.34%15.00%
Ian Morris10.34%15.00%
Total296100.00%20100.00%


static unsigned int arp_state_to_flags(struct neighbour *neigh) { if (neigh->nud_state&NUD_PERMANENT) return ATF_PERM | ATF_COM; else if (neigh->nud_state&NUD_VALID) return ATF_COM; else return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3380.49%562.50%
Changli Gao614.63%112.50%
Arnaldo Carvalho de Melo12.44%112.50%
Eric Dumazet12.44%112.50%
Total41100.00%8100.00%

/* * Get an ARP cache entry. */
static int arp_req_get(struct arpreq *r, struct net_device *dev) { __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr; struct neighbour *neigh; int err = -ENXIO; neigh = neigh_lookup(&arp_tbl, &ip, dev); if (neigh) { if (!(neigh->nud_state & NUD_NOARP)) { read_lock_bh(&neigh->lock); memcpy(r->arp_ha.sa_data, neigh->ha, dev->addr_len); r->arp_flags = arp_state_to_flags(neigh); read_unlock_bh(&neigh->lock); r->arp_ha.sa_family = dev->type; strlcpy(r->arp_dev, dev->name, sizeof(r->arp_dev)); err = 0; } neigh_release(neigh); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)14188.12%1178.57%
Eric Dumazet1710.62%17.14%
Benjamin Collins10.62%17.14%
Al Viro10.62%17.14%
Total160100.00%14100.00%


static int arp_invalidate(struct net_device *dev, __be32 ip) { struct neighbour *neigh = neigh_lookup(&arp_tbl, &ip, dev); int err = -ENXIO; if (neigh) { if (neigh->nud_state & ~NUD_NOARP) err = neigh_update(neigh, NULL, NUD_FAILED, NEIGH_UPDATE_F_OVERRIDE| NEIGH_UPDATE_F_ADMIN); neigh_release(neigh); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Maxim Levitsky7398.65%150.00%
Stephen Hemminger11.35%150.00%
Total74100.00%2100.00%


static int arp_req_delete_public(struct net *net, struct arpreq *r, struct net_device *dev) { __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr; __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr; if (mask == htonl(0xFFFFFFFF)) return pneigh_delete(&arp_tbl, net, &ip, dev); if (mask) return -EINVAL; return arp_req_set_proxy(net, dev, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7777.00%850.00%
Pavel Emelyanov1212.00%318.75%
Al Viro55.00%16.25%
Eric W. Biedermann22.00%16.25%
Herbert Xu22.00%16.25%
Adrian Bunk11.00%16.25%
Denis V. Lunev11.00%16.25%
Total100100.00%16100.00%


static int arp_req_delete(struct net *net, struct arpreq *r, struct net_device *dev) { __be32 ip; if (r->arp_flags & ATF_PUBL) return arp_req_delete_public(net, r, dev); ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; if (!dev) { struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0); if (IS_ERR(rt)) return PTR_ERR(rt); dev = rt->dst.dev; ip_rt_put(rt); if (!dev) return -EINVAL; } return arp_invalidate(dev, ip); }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov5946.09%216.67%
Linus Torvalds (pre-git)4333.59%433.33%
David S. Miller1814.06%216.67%
Maxim Levitsky32.34%18.33%
Denis V. Lunev21.56%18.33%
Changli Gao21.56%18.33%
Ian Morris10.78%18.33%
Total128100.00%12100.00%

/* * Handle an ARP layer I/O control request. */
int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg) { int err; struct arpreq r; struct net_device *dev = NULL; switch (cmd) { case SIOCDARP: case SIOCSARP: if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) return -EPERM; case SIOCGARP: err = copy_from_user(&r, arg, sizeof(struct arpreq)); if (err) return -EFAULT; break; default: return -EINVAL; } if (r.arp_pa.sa_family != AF_INET) return -EPFNOSUPPORT; if (!(r.arp_flags & ATF_PUBL) && (r.arp_flags & (ATF_NETMASK | ATF_DONTPUB))) return -EINVAL; if (!(r.arp_flags & ATF_NETMASK)) ((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr = htonl(0xFFFFFFFFUL); rtnl_lock(); if (r.arp_dev[0]) { err = -ENODEV; dev = __dev_get_by_name(net, r.arp_dev); if (!dev) goto out; /* Mmmm... It is wrong... ARPHRD_NETROM==0 */ if (!r.arp_ha.sa_family) r.arp_ha.sa_family = dev->type; err = -EINVAL; if ((r.arp_flags & ATF_COM) && r.arp_ha.sa_family != dev->type) goto out; } else if (cmd == SIOCGARP) { err = -ENODEV; goto out; } switch (cmd) { case SIOCDARP: err = arp_req_delete(net, &r, dev); break; case SIOCSARP: err = arp_req_set(net, &r, dev); break; case SIOCGARP: err = arp_req_get(&r, dev); break; } out: rtnl_unlock(); if (cmd == SIOCGARP && !err && copy_to_user(arg, &r, sizeof(r))) err = -EFAULT; return err; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)32089.64%842.11%
Eric Dumazet133.64%210.53%
Pavel Emelyanov92.52%15.26%
Eric W. Biedermann61.68%210.53%
Changli Gao41.12%15.26%
Ian Morris10.28%15.26%
Arnaldo Carvalho de Melo10.28%15.26%
David S. Miller10.28%15.26%
Denis V. Lunev10.28%15.26%
Al Viro10.28%15.26%
Total357100.00%19100.00%


static int arp_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) { struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct netdev_notifier_change_info *change_info; switch (event) { case NETDEV_CHANGEADDR: neigh_changeaddr(&arp_tbl, dev); rt_cache_flush(dev_net(dev)); break; case NETDEV_CHANGE: change_info = ptr; if (change_info->flags_changed & IFF_NOARP) neigh_changeaddr(&arp_tbl, dev); break; default: break; } return NOTIFY_DONE; }

Contributors

PersonTokensPropCommitsCommitProp
Tommi Virtanen5359.55%125.00%
Timo Teräs2932.58%125.00%
Denis V. Lunev44.49%125.00%
Jiri Pirko33.37%125.00%
Total89100.00%4100.00%

static struct notifier_block arp_netdev_notifier = { .notifier_call = arp_netdev_event, }; /* Note, that it is not on notifier chain. It is necessary, that this routine was called after route cache will be flushed. */
void arp_ifdown(struct net_device *dev) { neigh_ifdown(&arp_tbl, dev); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo1161.11%150.00%
Linus Torvalds (pre-git)738.89%150.00%
Total18100.00%2100.00%

/* * Called once on startup. */ static struct packet_type arp_packet_type __read_mostly = { .type = cpu_to_be16(ETH_P_ARP), .func = arp_rcv, }; static int arp_proc_init(void);
void __init arp_init(void) { neigh_table_init(NEIGH_ARP_TABLE, &arp_tbl); dev_add_pack(&arp_packet_type); arp_proc_init(); #ifdef CONFIG_SYSCTL neigh_sysctl_register(NULL, &arp_tbl.parms, NULL); #endif register_netdevice_notifier(&arp_netdev_notifier); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2756.25%222.22%
Linus Torvalds (pre-git)1225.00%444.44%
Tommi Virtanen612.50%111.11%
Américo Wang24.17%111.11%
Shirley Ma12.08%111.11%
Total48100.00%9100.00%

#ifdef CONFIG_PROC_FS #if IS_ENABLED(CONFIG_AX25) /* ------------------------------------------------------------------------ */ /* * ax25 -> ASCII conversion */
static void ax2asc2(ax25_address *a, char *buf) { char c, *s; int n; for (n = 0, s = buf; n < 6; n++) { c = (a->ax25_call[n] >> 1) & 0x7F; if (c != ' ') *s++ = c; } *s++ = '-'; n = (a->ax25_call[6] >> 1) & 0x0F; if (n > 9) { *s++ = '1'; n -= 10; } *s++ = n + '0'; *s++ = '\0'; if (*buf == '\0' || *buf == '-') { buf[0] = '*'; buf[1] = '\0'; } }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo13086.67%133.33%
Ralf Bächle1610.67%133.33%
Changli Gao42.67%133.33%
Total150100.00%3100.00%

#endif /* CONFIG_AX25 */ #define HBUFFERLEN 30
static void arp_format_neigh_entry(struct seq_file *seq, struct neighbour *n) { char hbuffer[HBUFFERLEN]; int k, j; char tbuf[16]; struct net_device *dev = n->dev; int hatype = dev->type; read_lock(&n->lock); /* Convert hardware address to XX:XX:XX:XX ... form. */ #if IS_ENABLED(CONFIG_AX25) if (hatype == ARPHRD_AX25 || hatype == ARPHRD_NETROM) ax2asc2((ax25_address *)n->ha, hbuffer); else { #endif for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < dev->addr_len; j++) { hbuffer[k++] = hex_asc_hi(n->ha[j]); hbuffer[k++] = hex_asc_lo(n->ha[j]); hbuffer[k++] = ':'; } if (k != 0) --k; hbuffer[k] = 0; #if IS_ENABLED(CONFIG_AX25) } #endif sprintf(tbuf, "%pI4", n->primary_key); seq_printf(seq, "%-16s 0x%-10x0x%-10x%-17s * %s\n", tbuf, hatype, arp_state_to_flags(n), hbuffer, dev->name); read_unlock(&n->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo20591.52%116.67%
Roel Kluin94.02%116.67%
Cheng Renquan62.68%116.67%
Igor Maravić20.89%116.67%
Ralf Bächle10.45%116.67%
Harvey Harrison10.45%116.67%
Total224100.00%6100.00%


static void arp_format_pneigh_entry(struct seq_file *seq, struct pneigh_entry *n) { struct net_device *dev = n->dev; int hatype = dev ? dev->type : 0; char tbuf[16]; sprintf(tbuf, "%pI4", n->key); seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n", tbuf, hatype, ATF_PUBL | ATF_PERM, "00:00:00:00:00:00", dev ? dev->name : "*"); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo7798.72%150.00%
Harvey Harrison11.28%150.00%
Total78100.00%2100.00%


static int arp_seq_show(struct seq_file *seq, void *v) { if (v == SEQ_START_TOKEN) { seq_puts(seq, "IP address HW type Flags " "HW address Mask Device\n"); } else { struct neigh_seq_state *state = seq->private; if (state->flags & NEIGH_SEQ_IS_PNEIGH) arp_format_pneigh_entry(seq, v); else arp_format_neigh_entry(seq, v); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo6289.86%133.33%
David S. Miller68.70%133.33%
Joe Perches11.45%133.33%
Total69100.00%3100.00%


static void *arp_seq_start(struct seq_file *seq, loff_t *pos) { /* Don't want to confuse "arp -a" w/ magic entries, * so we tell the generic iterator to skip NUD_NOARP. */ return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_SKIP_NOARP); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller30100.00%1100.00%
Total30100.00%1100.00%

/* ------------------------------------------------------------------------ */ static const struct seq_operations arp_seq_ops = { .start = arp_seq_start, .next = neigh_seq_next, .stop = neigh_seq_stop, .show = arp_seq_show, };
static int arp_seq_open(struct inode *inode, struct file *file) { return seq_open_net(inode, file, &arp_seq_ops, sizeof(struct neigh_seq_state)); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2369.70%133.33%
Pavel Emelyanov721.21%133.33%
Eric W. Biedermann39.09%133.33%
Total33100.00%3100.00%

static const struct file_operations arp_seq_fops = { .owner = THIS_MODULE, .open = arp_seq_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_net, };
static int __net_init arp_net_init(struct net *net) { if (!proc_create("arp", S_IRUGO, net->proc_net, &arp_seq_fops)) return -ENOMEM; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo1747.22%125.00%
Hideaki Yoshifuji / 吉藤英明822.22%125.00%
Denis V. Lunev616.67%125.00%
Gao Feng513.89%125.00%
Total36100.00%4100.00%


static void __net_exit arp_net_exit(struct net *net) { remove_proc_entry("arp", net->proc_net); }

Contributors

PersonTokensPropCommitsCommitProp
Denis V. Lunev1676.19%150.00%
Gao Feng523.81%150.00%
Total21100.00%2100.00%

static struct pernet_operations arp_net_ops = { .init = arp_net_init, .exit = arp_net_exit, };
static int __init arp_proc_init(void) { return register_pernet_subsys(&arp_net_ops); }

Contributors

PersonTokensPropCommitsCommitProp
Denis V. Lunev16100.00%1100.00%
Total16100.00%1100.00%

#else /* CONFIG_PROC_FS */
static int __init arp_proc_init(void) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo12100.00%1100.00%
Total12100.00%1100.00%

#endif /* CONFIG_PROC_FS */

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)260043.41%4924.02%
Arnaldo Carvalho de Melo72312.07%83.92%
David S. Miller2654.42%178.33%
Pavel Emelyanov2414.02%94.41%
Julian Anastasov2183.64%20.98%
Thomas Graf1853.09%31.47%
Linus Torvalds1652.75%41.96%
Eric Dumazet1312.19%136.37%
Eric W. Biedermann1302.17%115.39%
Jesper Dangaard Brouer1001.67%10.49%
Jiri Benc991.65%20.98%
Alexey Kuznetsov951.59%10.49%
Denis V. Lunev851.42%73.43%
Herbert Xu761.27%52.45%
Maxim Levitsky761.27%10.49%
Hideaki Yoshifuji / 吉藤英明751.25%73.43%
Jiri Pirko711.19%20.98%
Tommi Virtanen701.17%10.49%
Rusty Russell621.04%10.49%
Maciej W. Rozycki480.80%10.49%
Timo Teräs460.77%20.98%
Changli Gao390.65%20.98%
Shmulik Hen340.57%10.49%
Salam Noureddine280.47%10.49%
David Ahern270.45%10.49%
Zhang Shengju250.42%10.49%
Al Viro250.42%62.94%
Ben Greear220.37%10.49%
Patrick McHardy210.35%10.49%
Nicolas Dichtel180.30%10.49%
Ralf Bächle170.28%10.49%
Johannes Berg160.27%10.49%
Stephen Hemminger120.20%62.94%
Roland Dreier120.20%10.49%
Ian Morris120.20%10.49%
Américo Wang120.20%20.98%
Rick Jones110.18%10.49%
Joe Perches100.17%31.47%
Gao Feng100.17%20.98%
Roel Kluin90.15%10.49%
Neil Horman90.15%31.47%
Octavian Purdila90.15%10.49%
Igor Maravić70.12%10.49%
David L Stevens70.12%10.49%
Cheng Renquan60.10%10.49%
Jan Engelhardt50.08%20.98%
Adrian Bunk50.08%20.98%
Rolf Manderscheid40.07%10.49%
Harvey Harrison30.05%20.98%
Christoph Hellwig30.05%10.49%
Randy Dunlap30.05%10.49%
Jonas Danielsson20.03%10.49%
Tejun Heo10.02%10.49%
Andi Kleen10.02%10.49%
Arjan van de Ven10.02%10.49%
Paul Gortmaker10.02%10.49%
Benjamin Collins10.02%10.49%
Shirley Ma10.02%10.49%
Total5990100.00%204100.00%
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